Last night I shoved a weathermeter weatherflow device ($60) in a Kestrel windvane mount ($50) on a small tripod, paired it with 4DOF and Strelok Pro ($12) on my iPhone. I put a box fan in front of it to simulate a 12mph wind. My dog kept walking back and forth between it, sometimes knocking the vane and/or blocking the fan. Variable wind, variable direction, perfect.
A few yards away, I was able to sit with my rifle with my iPhone. I could point the phone at various targets, input the range and shooting angle and get real-time updated firing solutions, any target, any distance, any angle, any DoF, no matter what the wind dog was doing.
Problem with this, aside from ruggedness, batteries etc... is that it was kind of a pain to set three variables (range, angle, DoF) for
each new target, although the apps make it easy with the built-in phone compass/level. Range digits were the only thing I had to really peck repeatedly at the phone for since neither app is integrated with a rangefinder.
Even better would be all that in a rugged 2 or 3 device package, without having to fight with the display interface, eg with this mounted to the side:
The Kestrel HUD wirelessly connects to your Kestrel so you can easily see shooting solutions for up to 10 targets on this clear, convenient, gun mounted display, providing the fastest, most accessible targeting solution data available. Preorder now. Full product release for shipment is scheduled...
kestrelinstruments.com